A G-TRAC MANUAL
IOM-24 Page 15 March 1999 R1
after the main shut off valve still flowing due to its pressure and airflow patterns. Possible solutions to
stop flame failures due to residual flame are:
A. Slightly increase the quantity of low fire air to the burner to blow out the residual flame.
B. Reduce or eliminate the flame around the flame rod by removing the source of the fuel. It is possible
the fuel source is the nozzle located at 3 o’clock on the diffuser plate. Try to temporarily block this
nozzle and note the results.
C. Place a time delay relay into the FR flame relay circuit to not allow the flame relay
to pull in until the
residual flame has burnt out. (Usually 30-60 seconds).
D. Cracked spark and flame rods.
E. Proper positioning of the spark rod in relation to the pilot orifice and the depth of the pilot stub past
the burner retention plate is very important (see sketch below).
F. A poor ground path can contribute to flame failure problems. If this is suspected a ground wire can be
screwed onto the retention plate and then connected to ground screen marked on the Fireye sub-
base.
“B” and “C” BURNER ELECTRODE DETAIL
All Gas Ignition Electrode Require ” Gap for Sparking.
XIV. CHANGING A G-TRAC IN THE FIELD
TO SET PRE-PURGE TIME DELAY
Pre-purge time delay is set by cutting the pre-purge jumpers on the back of the G-TRAC board. This is best
to do before installing a new board. Cut the same jumpers as were cut on the old board or contact the
factory (after getting unit serial number) for correct jumper information. Pre-purge time is determined by the
size of the heat exchanger and the time required to vent it.
The number in the brackets is the jumper wire setting. (0 = cut; 1 = uncut). The first digit refers to PP1,
second to PP2, etc. Time is in MIN: SEC
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